Hi Miquel,

I love your patch! Yet something to improve:

[auto build test ERROR on mtd/nand/next]
[also build test ERROR on mtd/mtd/next v5.13-rc1 next-20210510]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Miquel-Raynal/Bring-GPIO-CS-support-to-the-Arasan-controller-driver/20210510-184335
base:   https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next
config: i386-randconfig-a014-20210510 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/09c3e51f9529c4773d8a5999e34cf241de5a5dda
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Miquel-Raynal/Bring-GPIO-CS-support-to-the-Arasan-controller-driver/20210510-184335
        git checkout 09c3e51f9529c4773d8a5999e34cf241de5a5dda
        # save the attached .config to linux build tree
        make W=1 W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>, old ones prefixed by <<):

>> ERROR: modpost: "rawnand_dt_parse_gpio_cs" [drivers/mtd/nand/raw/arasan-nand-controller.ko] undefined!

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org